LGIP-470R Replacement Battery LG KF350 3.7V 800mAh Li-ion

LG KF350 / KP500 Cookie Series — 3.7V Li-ion Replacement Battery (LGIP-470R)

This is a 3.7V Li-ion cell rated at 800mAh (2.96Wh), built to the LGIP-470R spec. It fits the LG KF350, KF350 Ice Cream, KP500 Cookie, and KP501. If the original cell has swollen, lost capacity, or stopped holding charge, this is the direct swap.

• KF350 and KP500 series fit: These models share the same 3.7V single-cell architecture, identical connector pinout, and the same physical footprint — 44.00 × 37.60 × 4.80mm. The BMS handshake and charge termination voltage are consistent across the range, so one cell covers all listed variants.
• Bench tested on actual hardware: We cycled this cell through charge and discharge on the KP500 platform. The BMS accepted the cell cleanly, charge termination triggered correctly at 4.2V, and protection cut-off engaged as expected at the low-voltage floor. No false readings on the charge indicator.
• Fuel gauge recalibration after swap: On first use, disable any power-saving shortcuts and run one full discharge-to-charge cycle before relying on the battery indicator. The KF350 fuel gauge IC is calibrated to the old cell's discharge curve — one complete cycle resets that baseline against the new cell before the phone can report accurate percentages.

Why the KF350 reports wrong battery percentage after a cell swap

The KF350 uses a basic coulomb-counting fuel gauge that builds its model from accumulated charge and discharge data on the original cell. When you install a new cell, that learned model is stale — it still reflects the degraded capacity curve of the old battery. The phone may show 100% immediately after install, then drop sharply once any real load hits. One full discharge cycle down to automatic shutdown, followed by a complete charge to 4.2V, forces the IC to rebuild its reference curve against the new cell. After that single cycle, percentage readings stabilise.

Sudden shutdown at 20–30% on the LGIP-470R replacement

This is a voltage cliff problem, not a capacity problem. Under screen or transmit load, the cell voltage drops faster than the fuel gauge expects — the phone's low-voltage protection trips before the displayed percentage reaches zero. It happens most often when the fuel gauge IC hasn't completed its first recalibration cycle on the new cell. Run one full discharge-charge cycle as described above. If shutdowns continue past that, check that the battery contacts on the phone are clean and making full contact — even 0.1Ω of extra resistance at the connector is enough to push cell voltage below the 3.0V protection threshold under load.